years ago, the ford explorer I was driving with my wife, young son in his infant seat and the chocolate lab, secured in the back in its crate met some black ice
long story short, it left the road went down the hill and turned over 1 1/2 times ending with the driver side down and facing the other way
only injury was to my elbow when I punched out the side window while it did that
not sure if any other type of restraint would have protected us from the 90 lb plus dog flying around the vehicle or protect the dog itself